Automatic analyzer

ABSTRACT

Realized is an automatic analyzer that allows appropriate setting of analytical parameters which incorporate batch-to-batch variations in characteristics of reagents. The analytical parameters 35, consisting of fixed parameters 37 and variable parameters 38, are stored into a storage unit of the automatic analyzer. The fixed parameters 37 include a reagent-dispensing quantity, a sample-dispensing quantity, measuring wavelength, and the like, each of which becomes a pivot for measurement of a sample, and parameters to be used are selected from an item code and bottle code assigned to a reagent bottle 36. The variable parameters 38 include a linearity check value, a prozone check value, reaction limit absorbance, technical limits, first standard solution absorbance, variation allowable absorbance, and the like, each of which is associated with sample-measurement result checks. The variable parameters 38 have a plurality of versions, and the automatic analyzer has a control unit, which reads bar code information from the reagent bottle and adopts variable parameters of a corresponding version with the item code, the bottle code, and batch information relating to the reagent, as a key.

TECHNICAL FIELD

The present invention relates to an automatic analyzer that conductsqualitative and quantitative analyses upon blood, urine, and otherbiological samples.

BACKGROUND ART

When a reagent to be used in an automatic analyzer for clinicallaboratory tests is developed, optimal parameters are determined as ameasuring wavelength, a reagent volume, a sample volume, an analyticalmethod, and the like, from test results. The registration of thedetermined analytical parameters is applied for under the PharmaceuticalAffairs Act, and the parameters are registered. After the applicationfor registration, the analytical parameters and formulation of thereagent cannot be easily changed under the Pharmaceutical Affairs Act.

Incidentally, a reaction tank is used to manufacture a reagent, and thevolume of reagent that can be produced during one manufacturingoperation is predetermined. This production volume is managed as onebatch, and reagent bottles are filled in fixed quantities and sold. Atthis time, each reagent bottle is inscribed with the batch informationand managed.

The reaction characteristics of a reagent intended to measure theconcentration of a desired substance in a sample by utilizing chemicalreactions such as an enzyme reaction and antigen-antibody reactionslightly differ according to factors such as the differences in thequantities of materials in the reagent and the time of the year when thereagent is formulated. The values of the reagent, such as sensitivityand the absorbance of a blank, therefore, vary from batch to batch.

In conventional automatic analyzers, the reagent volume, measuringwavelength, and other parameters subjected to pharmaceutical affairsapplication registration have been stored with a calibration resultallowable range into a storage unit as analytical parameters for eachmeasurement item. In this case, the analytical parameters have beenassigned without allowable data changed on a reagent batch basis,

When the reagent is set in an automatic analyzer in order to analyze apatient sample, calibration takes place before the analysis of thepatient sample to calibrate the automatic analyzer according to theparticular composition of the reagent. It is currently common to performcorrections on a reagent batch basis by calibration for minimaldifferences in reaction characteristics between the produced reagentbatches.

With regard to such differences in reaction characteristics betweenproduced reagent batches, Patent Document 1 discloses an automaticanalyzer that removes any differences in reaction characteristicsbetween reagent batches by holding reagent bar codes with characteristicanalytical parameters assigned for each reagent batch, and therebymeasures data accurately without keyboard entry.

Recently, more detailed data checking than ever before has come to berequired for clinical laboratory tests. Data-checking methods enable anallowable range to be set during apparatus parameterizing, and an alarmto be displayed upon detection of any data overstepping the allowablerange.

Data-checking methods differ according to the reaction characteristicsof the reagent used. For example, these differences relate to: alinearity check value, a prozone check value, reaction limit absorbance,and technical limits; and first standard solution absorbance, variationallowable absorbance, sensitivity allowable absorbance, and convergenceallowable absorbance, each of which is associated with calibrationmeasurement result checks.

It has been difficult with these checking methods to detect slightdifferences in chemical reaction, but the reaction process approximationmethod presented in Patent Document 2 allows determination based uponquantitative recognition of the differences between reagent batches andthe differences in chemical characteristics between the reagents Usingthis checking method to assess the quality of the reagents allows one todetect the differences in reaction characteristics between the reagentbatches.

PRIOR ART LITERATURE Patent Documents

Patent Document 1: JP-1996-262029-A

Patent Document 2: JP-2009-204448-A

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

To improve the reliability of an automatic analyzer with respect tomeasurement results, before these measurement results are reported to adoctor, there is a need to detect abnormal measurement results. Thedetection can be achieved if the analyzer has an ability to detect thedata obtained when the measuring range corresponding to the reagentused, or variations or other such reagent-derived fluctuations as in theblank value which changes with the deterioration of the reagent overstepa fixed management value range.

The management value changes with the reagent batch. Accordingly, if themanagement value is registered as analytical parameters and the fixeddata is set irrespective of batch changes, even when the data settingsare appropriate for a reagent batch, a data alarm might be detected forindividual values once the batch has been replaced by another batch.

The data for which the data alarms have been detected, however, may notnecessarily all be abnormal. In addition, the reagents of the batch thathave been used may not have all deteriorated. Conducting corrections bycalibration or changing the data settings to the correct ones for eachreagent batch is most likely to allow measurement to be continued.

In conventional automatic analyzers, however, there is a case in which,when a reagent is used in the automatic analyzer, the set valuedesignated by the manufacturer of the reagent during the entry of theparameters for the analyzer may be set and used as the analyticalparameters In another case that an automatic analyzer uses ageneral-purpose reagent or the like for which a user enters and setsanalytical parameters himself or herself, it has been necessary for theuser to enter an appropriate set value based upon the measurementresults obtained by, for example, assaying a control sample and/or astandard substance using the reagent, or upon the empirical dataobtained from actual analytical operations.

Additionally, since the set values based upon the value designated fromthe reagent manufacturer are not the ones designated for each batch,these set values are not necessarily appropriate, Furthermore, in a casethat the user is to enter and set the appropriate value, the user needsto update the set values with each change of the reagent batch, so thathis/her job is heavily burdened, and these setting functions arecurrently not utilized,

Besides, the number of reagent batches used in one automatic analyzer isnot always one for each analytical item, and there is a case in whichthe analysis of hundreds of samples is requested and reagent batches arechanged during the sample measurements. In such a case, a function thatexecutes calibration when the reagent batch is changed allows thecorrection based on batch-specific calibration.

In terms of analytical parameters, however, one parameter corresponds toone analytical item and when two or more reagent batches are present atthe same time, and if two or more reagent batches exist simultaneously,the set values of the analytical parameters cannot be changed during themeasurement process in which the apparatus is active.

For these reasons, the conventional techniques have had a problem inthat the parameter data to be changed with a change of the reagent batchcannot be appropriately set.

An object of the present invention is to realize an automatic analyzerthat allows appropriate setting of analytical parameters whichincorporate batch-to-batch variations in characteristics of reagents.

Means for Solving the Problem

In order to attain the above object, the present invention is configuredas follows.

An aspect of the present invention is an automatic analyzer that mixes areagent into a sample and analyzes the sample, the analyzer including:fixed parameter information relating to reagent information on thereagent used, the fixed parameter information being determined byanalytical items; storage means for storing therein variable parameterswhich vary with a production batch of the reagent, the storage meansbeing required for assessment of measurement results on the sample; anda control unit configured to, by use of the fixed parameter informationand variable parameter information stored in the storage means, controlthe mixing of the sample and the reagent and analytical operation of theanalyzer for the sample.

Effects of the Invention

In accordance with the present invention is achieved the automaticanalyzer allowing the appropriate setting of the analytical parametersincorporating the batch-to-batch variations in the characteristics ofreagents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic configuration diagram of an automatic analyzer towhich the present invention is applied.

FIG. 2 is a data structural diagram of analytical parameters stored intoa storage unit in a first embodiment of the present invention.

FIG. 3 is a flowchart of an operational sequence from reagent setting tomeasurement result output, in the first embodiment of the presentinvention.

FIG. 4 is a diagram showing an example of a display screen for theanalytical parameters in the first embodiment of the present invention.

FIG. 5 is a diagram that shows data obtained when calibration isconducted on a reagent batch basis in the first embodiment of thepresent invention.

FIG. 6 is a diagram showing an example of a display screen for managingchanges in calibration check values with time in a second embodiment ofthe present invention.

MODE FOR CARRYING OUT THE INVENTION

Hereunder, embodiments of the present invention will be describedreferring to the accompanying drawings.

First Example

A first embodiment of the present invention is described below taking asan example an automatic analyzer designed to processcassette-accommodated reagent bottles placed at a rate of one set forone cassette.

FIG. 1 is a schematic configuration diagram of the automatic analyzer towhich the first embodiment of the present invention is applied.Referring to FIG. 1, on a cabinet 21, a plurality of reaction vessels 5are arrayed circumferentially on a reaction disk 9.

A plurality of reagent cassettes 16 can be arranged circumferentially oneach of reagent disks 15. One reagent cassette 16 can accommodate amaximum of three types of reagents (first to third reagents).

A transport mechanism 3 that moves a rack 1 with a sample container 2rested thereupon is placed near the reaction disk 9. Rails 25 and 26 arearranged on the reagent disks 15, and a reagent probe 11 adapted to movein tri-axial directions, a reagent bottle-opening mechanism 12, and areagent cassette transport mechanism 14 are set up above the rail 25.

In addition, a reagent probe 13 adapted to move in tri-axial directionsis set up above the rail 26. The reagent probes 11, 13 connect to areagent pump not shown.

New reagent cassettes are loaded from a reagent cassette loading port18. Bar codes inscribed on each of the new reagent cassettes beforehandare read by a reagent bar-code reader 17.

A sample probe 4 formed to rotate and to move vertically is placedbetween the reaction vessels 5 and the transport mechanism 3. The sampleprobe 4 connects to a sample pump not shown. Stirrers 6 and 7, a lightsource and optical detector 10, and a vessel-cleaning mechanism 8 arearranged around the reaction disk 9. The vessel-cleaning mechanism 8connects to a cleaning pump not shown.

The sample pump (not shown), the reagent pump (not shown), the cleaningpump (not shown), the light source and optical detector 10, the reactiondisk 9, the reagent disks 15, the reagent probes 11, 13, and the sampleprobe 4 are each connected to a controller 20.

The transport mechanism 3 transports the rack 1 and after the sampleprobe 4 has aspirated a sample retained in the sample container 2 of therack 1 and placed in a predetermined sample-aspirating position, thesample probe 4 releases the sample into a reaction vessel 5 of thereaction disk 9, at a sample-dispensing position.

The reaction disk 9 then rotates to move the reaction vessel 5 with thesample contained therein to a first reagent-dispensing position. At thisposition, the first reagent probe 11 dispenses a first reagent from onereagent cassette 16 retained on the reagent disk 15, into the reactionvessel 5. The reaction vessel 5 into which the first reagent has beendispensed is moved to a stirring position, where the stirrer 6 thenstirs the sample and the first reagent.

Additionally, when a second reagent is to be added, the stirred reactionvessel 5 is moved to a second reagent-dispensing position, at whichposition the second reagent probe 13 then dispenses a second reagent,the same reagent as the first reagent retained on the reagent disk 15,from the reagent cassette 16 into the reaction vessel 5. The reactionvessel 5 containing the dispensed second reagent in addition to thefirst reagent is moved to a stirring position, at which position thestirrer 7 then stirs the sample, first reagent, and second reagent inthe reaction vessel 5, thus generating a reaction solution.

The reaction vessel 5 with the reaction solution generated therein ismoved to a measuring position, where the reaction vessel 5 then passesthrough a beam of light that has been emitted from a light source of theoptical detector 10, and absorbance of the light at this time isdetected by a multi-wavelength photometer which is a photometricmechanism 10 of the optical detector. An absorbance signal that has thusbeen created by the detection enters a control unit 33, which thenconverts the signal into a concentration signal of the sample. Thecontrol unit 33 simultaneously conducts data alarm checks based upon theabsorbance.

The data that has been converted into the concentration signal is storedinto a storage unit 32 and displayed on a display unit 34. The reactionvessel 5 that has been subjected to photometry is moved to the cleaningmechanism 8 and cleaned therein to be used for following analysis.

An operating unit 31 includes, for example, a keyboard and a CRTmonitor, and is used to register measurement items as well asinformation on the sample to be analyzed, and to set analyticalparameters and the like.

Next, a structure of the analytical parameters stored into the storageunit 32 is shown in FIG. 2. Referring to FIG. 2, information on theanalytical parameters 35 is stored into the storage unit 32, and theanalytical parameters 35 consist of fixed parameters 37 and variableparameters 38. Registered by way of example as the fixed parameters 37are a reagent-dispensing quantity, a sample-dispensing quantity,measuring wavelength, and the like, and these values become a pivot forthe measurement of the sample. Parameters to be used can be selectedfrom the item code and bottle code information assigned to the reagentbottle 36.

Registered by way of example as the variable parameters 38 are alinearity check value, a prozone check value, reaction limit absorbance,and technical limits, each of which is associated with general-samplemeasurement result checks; and first standard solution absorbance,variation allowable absorbance, sensitivity allowable absorbance,convergence allowable absorbance, and the like, each of which isassociated with calibration measurement result checks.

In addition, depending upon reaction characteristics of the reagent, amethod of calibration used may also be registered as one of the variableparameters 38. Furthermore, a parameter obtained through reactionprocess approximation may be more preferably added as one of thevariable parameters 38.

The variable parameters 38 have a plurality of versions of variableparameter tables for one fixed parameter table, and under control fromthe control unit 33, recording-medium information such as the bar codeinformation inscribed on the reagent bottle is read, whereby the itemcode, the bottle code, and batch information relating to the reagent areused as a key and the variable parameters of the version correspondingto the key are adopted.

FIG. 3 is a flowchart of an operational sequence from setting of onereagent cassette 16 to output of measurement results. The control unit33 controls the sequence.

Referring to FIG. 3, when the reagent cassette (reagent bottle) 16 isset up on the reagent disk 15 in the automatic analyzer (step S1), thereagent bar-code reader 17 reads the bar code information assigned tothe reagent bottle 16 (step S2).

The item code of the reagent is added to the bar code informationrecorded on a recording medium accompanying the reagent cassette 16. Thecontrol unit 33, therefore, determines whether analytical parameters areregistered in the storage unit 32 with the reagent item code as a key(step S3).

If determination results in step S3 are negative (NO), that is, ifanalytical parameters are not registered in the storage unit 32,analytical parameters are registered therein (step S4). In this step, ifthe information assigned to the reagent bottle 16 contains analyticalparameters, the parameter information can also be stored into thestorage unit 32 of the apparatus automatically where necessary. Afterthe parameter registration, process control proceeds to step S5.

If the determination results in step S3 are positive (YES), that is, ifanalytical parameters are registered in the storage unit 32, the controlunit 33 next determines whether variable parameters are registered inthe storage unit 32 with the registered reagent batch number as a key(step S5).

If determination results in step S5 are negative (NO), that is, ifvariable parameters 38 are not registered in the storage unit 32,variable parameter information is stored into the storage unit 32 (stepS6).

At this time, variable parameter data corresponding to individualreagent batches may be acquired from a server supplied from amanufacturer of the reagent, via a communication network connected tothe automatic analyzer. In addition, if the information assigned to thereagent bottle 16 contains variable parameter information, thisparameter information may be stored into the storage unit 32 of theapparatus automatically where necessary. Furthermore, a user can assignvariable parameter information directly.

If the determination results in step S5 are positive (YES), that is, ifvariable parameters are registered in the storage unit 32, only thereagent batch information corresponding to the reagent cassette 16 setup in the automatic analyzer is incorporated from the plurality ofvariable parameters of information stored within the storage unit 32,into an analytical parameter screen of the display unit 34 (step S7).

Next, a standard solution is set (step S8) and then calibration isconducted (step S9). Calibration execution results are next checkedagainst a calibration check value that varies from batch to batch of thereagent, and thus whether the calibration execution results fall withinan allowable range is determined (step S10).

If calibration check results in step S10 are negative (NO), that is, ifthe calibration check results are not within the allowable range, analarm is displayed (step S11) to complete the sequence.

If the calibration check results in step S10 are positive (YES), thatis, if the calibration check results are within the allowable range,samples to be analyzed are set (step S12) and then a control sample anda general sample are analyzed (step S13).

After measurement of absorbance by the optical detector 10, thecalibration results are used to compute a concentration from themeasured value (step S14). Data check values such as a prozone value anda reaction process approximation factor are also computed aftercompletion of each sample measurement (step S15).

Measurement results are checked against the values that were obtained insteps S14, S15, and thereby whether the measurement results lie in theallowable range of the data check values is determined with the batchnumber of the reagent as a key (step S16).

If determination results in step S16 are negative (YES), that is, if themeasurement results are not within the allowable range of the data checkvalues, an alarm is displayed (step S17) and then the measured sampledata is output to the display unit 34 (step S18). This completes thesequence.

If the determination results in step S16 are positive (NO), that is, ifthe measurement results are within the allowable range of the data checkvalues, the determination results are displayed with the measuredvalues, on the display unit 34 (step S18). At this time, the measurementresults may be displayed on the display unit 34 in such a form as willenable the operator to readily identify the reagent batch correspondingto the results.

The way to store the information relating to the analytical parameters35 into the storage unit 32 of the automatic analyzer may be such thatwhen the reagent manufacturer sells a new batch of reagents, themanufacturer either registers the information by delivering it toautomatic analyzers within individual laboratory test rooms via theInternet, or assigns the information to reagent bottles in a form of,for example, a bar code, a QR code, or an IC chip.

Yet another system may be such that in a case of the information beingassigned to each reagent bottle in the form of a bar code or the like,when the reagent bottle is set in the automatic analyzer, theinformation is stored into the storage unit 32 of the apparatus. In afurther preferable scheme, a plurality of variable parameters 38 will bestorable into the storage unit 32 at the same time for each item codeand the variable parameters 38 to be adopted will be selectable from thereagent batch information, for each sample measurement operation.

In addition, the variable parameters 38 that have been stored will bereplaced by newly registered ones each time the reagent batch ischanged, and if a desired batch is not used for a fixed time period inthe apparatus, the parameter information will be deleted in order withthe oldest information first.

FIG. 4 is a diagram showing an example of a display screen for theanalytical parameters in the automatic analyzer according to the firstembodiment of the present invention.

Referring to FIG. 4, selection of an item from a list 39 of item namesregistered in the automatic analyzer displays analytical parameters atthe right of the screen. The analytical parameter screen is divided intosheets or the like according to the particular kind of analyticalparameter, and includes a screen 40 provided to set the parameters fixedon a reagent item basis, such as those relating to analysis andcalibration, and the characteristic parameters of the particularlaboratory test room. The analytical parameter screen also includes ascreen 41 that allows setting of the variable parameters which changefor each reagent batch.

The variable-parameter setting screen 41 retains a plurality of batchesof information and includes radio buttons 42 or the like to allowinformation selection for confirming the parameters corresponding toeach batch. Of the plurality of sets of information registered, desiredreagent information 43 that includes, for example, the item code, bottlecode, batch and sequence numbers, and expiry date of the reagent, can bedisplayed for each batch of the reagent.

Of the variable-parameter screen 41, a calibration result check value 44and a measured-data check value 45 are displayed in detail. The data ofthe two kinds is preferably displayed so that when the reagent is set inthe automatic analyzer, the variable-parameter information stored withinthe storage unit 32 will be displayed automatically referring to theitem code, batch number, and other information bar-coded on the reagentbottle. Additionally or alternatively, a data edit button 46 may bedisposed to enable a user of an administrator level to edit set values.

As described above, the apparatus in the first embodiment of the presentinvention is configured so as to read the item code, bottle code, andreagent batch information assigned to the reagent bottle 36. Theapparatus is also configured so as to store the read information intothe storage unit 32 independently for each of the two kinds ofparameters, namely the fixed parameters that relate to measurement anddo not vary from batch to batch of the reagent, and the variableparameters that relate to measurement result checks and vary from batchto batch of the reagent. The apparatus is further configured so as todetermine whether the information assigned to a new reagent bottle hasbeen stored in the storage unit 32, and store the information if it isnot stored.

Thus, measurement result checks can be conducted in definite distinctionbetween a reagent bottle relating to the same reagent batch, and areagent bottle relating to a different reagent batch.

In other words, if an independent value is assigned for each batch ofthe reagent and the value can be adopted for use in the apparatus, thisenables reagent-derived data alarms to be appropriately detected andthus the user to avoid overlooking abnormal data and reporting the wrongmeasurement results to a doctor.

In addition, the parameter value settings based upon the informationassigned to the reagent bottle are stored into the apparatusautomatically, which saves keyboard entry time and labor and eliminatesoperational mistakes in entry.

The appropriate detection of reagent-derived value alarms facilitatesisolation of apparatus-derived abnormalities and management of theapparatus state or condition, so there is a great advantage formaintenance by a manufacturer of the apparatus. The above also enablesthe manufacturer of the reagent to enter and set values on a batch basisin advance, present the reaction characteristics of the reagent inadvance, and provide a scope of guarantee for the reagent of the batch.As a result, the manufacturer can prevent a data alarm due to adeviation in a management value from occurring during data checks, andin response to a user inquiry about abnormal data, pursue/estimateprobable causes of the abnormal data from the reaction characteristicsof the batch.

Second Embodiment

Next, a second embodiment of the present invention is described below.

The second embodiment of the present invention is substantially the sameas the first embodiment in terms of both the apparatus configurationshown in FIG. 1, and the process steps shown in FIG. 3. Detaileddescription of the apparatus configuration and the process steps istherefore omitted herein.

The second embodiment of the present invention relates to an example inwhich the calibration check value calculated in steps S9 and S10 of FIG.3 is used for the control unit 33 to manage accuracy of the reagent andthe apparatus in addition to changes in a calculated value over time.

While it has been described in the first embodiment that a plurality ofvariable parameters 38 are stored and that information on the reagentbatches whose usage durations have exceeded a fixed term is deleted, theapparatus configuration in the second embodiment allows the user toreadily confirm changes in the quality of the reagent by storing theplurality of values of the variable-parameters 38 for a long period oftime and displaying time-varying (batch-by-batch) changes in data.

In steps S9 and S10 of FIG. 3, for example, when calibration takesplace, absorbance of the standard solution is measured and a calibrationcurve is created. The following four values that were entered ascalibration check data items in these steps are calculated: (1) firststandard solution allowable absorbance, (2) variation allowableabsorbance, (3) sensitivity allowable absorbance, and (4) convergenceallowable absorbance.

Briefly as shown in FIG. 5, variable parameters 48 and the check value50 calculated from calibration results are obtained for each reagentbatch 47 and each calibration execution date 49.

The control unit 33 compares the calculated check value with thepreviously set allowable value, and in step S11 of FIG. 3, displays analarm for any values overstepping the allowable range. At this time, thecalculated value and the previously set value are displayed on onegraph, for each calibration execution date or for each reagent batch.The calculated value is stored into the storage unit 32 along with theallowable values of the variable parameters for each reagent batch.

The following describes the management of the first standard solutionallowable absorbance, variation allowable absorbance, sensitivityallowable absorbance, and convergence allowable absorbance, each ofwhich is an independent variable parameter.

(1) Management of the First Standard Solution Allowable Absorbance

First, an absorbance range of the first standard solution to be used forcalibration is set, In most cases, this management value is that of ananalyte-free blank, so that this value denotes a magnitude of theabsorbance of the reagent itself.

FIG. 6 is a diagram showing an example of a display screen created whenthis management value is used for accuracy management.

Referring to graph (A), calibration execution dates 51 are plotted on ahorizontal axis, and the batches 52 of the reagent that were used on therespective dates are also shown. Absorbance 53 is plotted on a verticalaxis of FIG. 6, graph (A), and the allowable ranges (upper-limit valuesand lower-limit values) that were set for each reagent batch, and thefirst standard solution absorbance 50 that was calculated duringcalibration are also plotted. The allowable ranges and the calculatedvalues are displayed in such a format as of a legend 54.

Since time-varying changes in the set values for the reagent are managedin this way, the user can confirm changes in the quality of the reagent,for each reagent batch. In addition, since the automatic analyzerdisplays an alarm automatically for any deviations from the allowablevalue range, the user can readily confirm what value has deviated fromthe allowable range on what day, for what reagent batch, and to whatextent.

Additionally, since the user can confirm where in the allowable rangethe calibration result value exists, he/she can verify whether thevalue, when compared with the allowable value presented from the reagentmanufacturer, is a trifle large or a trifle small.

This value may, as shown in graph (B) of FIG. 6, be displayed so that avertical axis denotes a relative ratio 55 of the calculated value withrespect to the management allowable range. Making this display allowsrelative assessment of where in the allowable range the calibrationresults are located, without impacts of variations or the magnitude ofthe allowable range which changes with the reagent batch.

The absorbance of the first standard solution changes according toparticular composition of the reagent and is also affected by theapparatus (optical system) being used.

It can be seen from graph (B) of FIG. 6 that the automatic analyzerbeing used has the apparatus characteristics that the value measured foreach reagent batch will always be a trifle large in the allowable datapresented from the reagent manufacturer.

If the relative ratio is slightly low, this implies, for example, that alamp in the optical system of the automatic analyzer may havedeteriorated or that the characteristics of the apparatus may havedeteriorated. In addition, in a case that calibration is set so thatalthough the same reagent batch is used, only blank calibration isconducted when bottle changes take place, the deterioration of thereagent in the new bottle is likely to be detectible.

(2) Management of Variation Allowance Absorbance

Allowable values for variations in double-measurement results betweenstandard solutions are set in terms of percentage or absorbance, In thiscase, as shown in FIG. 6, calibration execution dates 51 and reagentbatches 52 are plotted on a horizontal axis of a graph displayed on thescreen, and corresponding allowable values and the value calculated fromfollowing expressions (1) and (2) after calibration has been executedare plotted on a vertical axis, with absorbance being shown as A inexpressions (1), (2):

([A _(STD(N)) (1st time)−A _(STD(N)) (2nd time)]/[A _(STD(N))(1sttime)+A _(STD(N)) (2nd time)]/2*100   (1)

[A _(STD(N)) (1st time)−A _(STD(N))(2nd time)]  (2)

where the square brackets ([ ]) denote an absolute value in expressions(1), (2).

(2) Management of Sensitivity Allowance Absorbance

Differences between the absorbance of first standard solutions and thatof span points are set. Sensitivity allowance absorbance is calculatedfrom expression (3) shown below, and this absorbance is checked whetherit lies in the allowable range of the upper-limit values and lower-limitvalues that have been set for each reagent batch. The plottings of thesensitivity allowance absorbance for each reagent batch, on the screendisplay, are preferably displayed in the same format or pattern as thatof FIG. 6, Character C in expression (3) below denotes concentrations ofeach standard solution.

A _(STD(N)) −A _(STD(1))/C _(STD(N)) −C _(STD(1))   (3)

(4) Management of Convergence Allowance Absorbance

Standard deviations (SDs) of differences between approximated absorbanceand measured absorbance, with respect to the concentrations of standardsolutions, on a nonlinear calibration curve and a linear (multipoint)calibration curve, are set up.

This check value is preferably displayed in substantially the sameformat or pattern as that of the sensitivity allowance absorbancedescribed as item (3) above.

As set forth above, if the calibration check value that has formerly notbeen used for management is managed in time-series form over a longperiod of time, since the apparatus states that have been assessed frommeasurement results obtained using accuracy management samples aremanaged, calibration results can also be used to confirm the quality ofthe reagent and to detect changes in apparatus state.

The second embodiment of the present invention yields substantially thesame advantageous effects of the first embodiment. The second embodimentalso enables calibration results to be used to confirm the quality ofthe reagent and to detect changes in apparatus state over time, sincethe apparatus is configured so that a plurality of variable parametersare stored into the storage unit 32 and the calibration check value thathas formerly not been used for management is managed in time-series formover a long period of time.

As described in the first embodiment and second embodiment of thepresent invention above, the management of measurement results in theautomatic analyzer applying the invention is more optimized than inautomatic analyzers based upon conventional techniques. In addition, theautomatic analyzer applying the invention contributes to reagent qualitycontrol, apparatus state management, and more, and is expected toimprove reliability of the measurement using the automatic analyzer.

In accordance with the present invention, therefore, the automaticanalyzer of the invention is expected to assist the operator in savinghis/her own labor, by automating his/her entry operations as well as bycontributing to improving reliability of the analyzer-aided datameasurement as viewed in terms of the user's convenience, the apparatuscharacteristics, and the reagent characteristics.

DESCRIPTION OF REFERENCE NUMBERS

1 . . . Sample rack, 2 . . . Sample container, 3 . . . Rack transportline, 4 . . . Sample-dispensing probe, 5 . . . Reaction vessel, 6, 7 . .. Stirrers, 8 . . . Cleaning mechanism, 9 . . . Reaction disk, 11, 13 .. . Reagent-dispensing probe, 12 . . . Reagent bottle-opening mechanism,14 . . . Cassette transport mechanism, 15 . . . Reagent disk, 16 . . .Reagent cassette, 17 . . . Reagent bar-code reader, 18 . . . Reagentcassette loading port, 20 . . . Controller, 31 . . . Operating unit, 32. . . Storage unit, 33 . . . Control unit, 34 . . . Display unit, 35 . .. Analytical parameter, 36 . . . Reagent bottle, 37 . . . Fixedparameter, 38 . . . Variable parameter, 39 . . . Item list, 40 . . .Fixed parameter, 41 . . . Variable parameter, 42 . . . Radio button forreagent batch selection, 43 . . . Reagent information, 44 . . .Calibration check value, 45 . . . Data check value, 46 . . . Dataregistration button, 47 . . . Reagent batch, 48 . . . Variable parameterset values, 49 . . . Calibration execution date, 50 . . .Calibration-derived calculations check value, 51 . . . Horizontal axis(Calibration execution date), 52 . . . Horizontal axis (Reagent batch),53 . . . Absorbance, 54 . . . Legend, 55 . . . Relative ratio

1. An automatic analyzer that mixes a reagent into a sample and analyzesthe sample, the analyzer comprising: fixed parameter informationrelating to reagent information on the reagent used, the fixed parameterinformation being determined by analytical items; storage means forstoring therein variable parameters which vary with a production batchof the reagent, the variable parameters being required for assessment ofmeasurement results on the sample; and a control unit configured to, byuse of the fixed parameter information and variable parameterinformation stored in the storage means, control the mixing of thesample and the reagent and analytical operation of the analyzer for thesample.
 2. An automatic analyzer that mixes a reagent into a sample andanalyzes the sample, the analyzer comprising: reagent informationreading means for reading reagent information assigned to a reagentcontainer accommodating the reagent; storage means for storing thereinthe reagent information; and control means for controlling operation ofthe reagent information reading means, the mixing of the sample and thereagent, and analytical operation for the sample, the control meansfurther using the reagent information read by the reagent informationreading means to calculate the fixed parameter information determined byanalytical items, and the variable parameters that vary with aproduction batch of the reagent and that are required for the assessmentof measurement results on the sample, thereby causing the storage meansto store therein the calculated parameters.
 3. The automatic analyzeraccording to claim 2, wherein: the variable parameter informationincludes a plurality of variable parameter tables corresponding to aplurality of reagent production batches, with respect to one fixedparameter table denoting the fixed parameter information.
 4. Theautomatic analyzer according to claim 3, wherein: after an elapse of afixed term from the storage of the variable parameters into the storagemeans, the control means deletes the stored variable parameters from thestorage means.
 5. The automatic analyzer according to claim 3, wherein:the variable parameter information includes at least one of thefollowing: a linearity check value, a prozone check value, reactionlimit absorbance, and technical limits; first standard solutionabsorbance, variation allowable absorbance, sensitivity allowableabsorbance, and convergence allowable absorbance, each of which isassociated with after-calibration measurement result checks; a method ofcalibration; and an assessment factor obtained through reaction processapproximation.
 6. The automatic analyzer according to claim 3, wherein:the control means controls quality of the reagent and time-varyingchanges in states of the analyzer, by plotting allowable values forfirst standard solution absorbance, variation allowable absorbance,sensitivity allowable absorbance, and convergence allowable absorbance,each of which is the variable parameter information and is associatedwith calibration checks, and plotting output data corresponding to thecheck values that are obtained upon the execution of calibration,wherein the plotting operation is conducted on a reagent batch basis anda calibration execution timing basis.
 7. The automatic analyzeraccording to claim 3, further comprising information display means,wherein the control means undertakes the following, on a reagent batchbasis and a calibration execution timing basis, plotting allowablevalues for first standard solution absorbance, variation allowableabsorbance, sensitivity allowable absorbance, and convergence allowableabsorbance, each of which is the variable parameter information and isassociated with calibration checks, plotting output data correspondingto the check values that are obtained upon the execution of calibration,and causing the information display means to display the allowablevalues and the output data that have been plotted.